/* may need math functions (e.g., cos) */
#include <math.h>
/* may need I/O functions (e.g., printf) */
#include <stdio.h>
/* declare HandyBoard library function prototypes */
int start_button (void);
int stop_button (void);
int digital (int port);
void fd (int motor);
void bk (int motor);
void off (int motor);
void alloff (void);
void ao (void);
void motor (int m, int p);
void beep (void);
void beeper_on (void);
void beeper_off (void);
void set_beeper_pitch (float freq);
int analog (int port);
int random (int max);
void sleep (float sec);
float seconds (void);
void reset_system_time (void);